diff --git a/src/Process/Manager.php b/src/Process/Manager.php
index b82d0b7..409f6f3 100644
--- a/src/Process/Manager.php
+++ b/src/Process/Manager.php
@@ -8,6 +8,8 @@
  */
 namespace OpenSwoole\Core\Process;
 
+use OpenSwoole\Process\Pool;
+
 class Manager
 {
     /**